Amazon Add-on Items can be purchased through Alexa by themselves

A Reddit user by the name of darkcellmp has discovered that if you ask Alexa to order an add-on item from Amazon, an order will be placed for that single item, even though the order total doesn’t meet the $25 minimum that is usually required when purchasing add-on items. If you’re a Prime member, you won’t be charged for shipping either, since all add-on items are technically eligible for free Prime shipping. So the next time you find yourself needing an add-on item, but don’t want to buy anything else, place the order through Alexa.

No, it still works. Sometimes, Alexa will add stuff to your list if you were not clear enough, it isn’t sold by Amazon itself (which the add-on item must be), or out of stock. But it’s October 2017, and I just ordered an add on solo just fine!